Incandescent lamp.



E. H. TATE. INGANDB SOENT LAMP. APPLICATION FILED MAY 4, 1911.

Patented July 16', 1912.

un memes UNITED STATES PATENT OFFICE.

EARL H. TATE, OF LOS ANGELES, CALIFORNIA.

Specification of Letters Patent. Patented J 1y 16, 1912, Applicationfiled May 4, 1911. Serial 10.62%927.

To all whom it may concern:

Be it known that I EARL H. Tarn; a cltizen of the United 'States.residing at Los' Angeles, in-the county of Los Angeles and State ofCalifornia, have invented certain new and useful Improvements inIncandescent Lamps: and I do declare the following to be a full. clear.and exact description of the inventiomgsuch as will enable othersskilled in 'the art to which it appertains-to make and use the same. I

This invention relates to incandescent electric lamps,'and the object ofthe same is to produce improvements in the means for connecting the basewith the bulb, the stem and the terminals with the neck of said bulb,and the filament hangers with the stem; and furthermore to improve theconstruction of said hangers themselves. These objects are accomplishedby the construction hereinafter more fully described and claimed and asshown in the drawings wherein- Figure l is a perspective view of thelamp partly in section; Fig. 2 is a central vertical section through thesame:' Fig. 3 is a detail horizontal section on the line 3-3 of Fig. 2:Fig. 4 is a similar view taken on the line 44 of Fig. 2; Fig. 5 is aplan view of one of the hangers on an enlarged scale.

In the drawings the numeral 1 designates the base having exterior screwthreads as usual to engage the lamp socket, and having around its lowerend a flange 2 containing an upstruck groove 3 within which liesaninsulat-i'ng cushion or ring 4 which bears upon the bulb 5 when thelatter is in place. The bulb is intended to be made of glass as usuah.and its neck is molded within the metallic part of the base 1, while itsbody rests within and is gently supported by the ring 4 so thatvibrations to. which the lamp is subjected are less likely to disconnectthe glass and metallic parts or to break the vacuum in the former.

The numeral 10 designates a stem, preferably tapering downward from itshead 11 as best seen in Fig. '3." These parts are by preference formedof a single piece of glass, and the head has corrugations on itsexterior and is intended to be molded within the neck of the bulb,the'tcrminal wires 12 being laid across said corrugations and moldedinto place so that they are reliably held out of contact with eachother. The outer end of one. wire is connected with the metallic part ofthe base 1 and the outer end INCANDESOENT LAMP.

of the other wire with the contact 13 as usual. Mounted 'upon and bypreference molded with said stem are two collars each consisting of twodisks spaced slightly apart for a purpose to appear. T he upper collarcarries the crescent-shaped hangers, and the lower collar carries theanchors which are awire frame 20 curvedin nearly a half circle andhaving an arm 21 projecting from the center of its length, and two pins22 projecting inward from its extremities toward each other, and a bow23 also of wire and curved on a larger arc than that of the frame. thishow having eyes 2-1-1 at its extremities which are mounted loosely onsaid pins 22. The arm 21 forms a stein which is inserted between the twodisks of the upper collar and molded therein,'and as seen there areseveral such hangers disposed' around this collar. Molded between thelowermost disks are books 27 also of wire and" [je'ctingoutward, and asseen there are several of these standing in ahorizontal plane throughthe lower end of the stem 10. Fi-

nally the filament 30 is led from a pin 22 of one hanger downward arounda book 27 and then up to the nearest pin 22 of the next hanger, fromwhich point the current must pass through the frame 20 to the o po; sitepin' 22f of this hanger, when the next"ti'la-' Inentt occurs. Theterminal wires 12 are connected up as best seen in Fig. 1. I have foundthat, this means of supporting the fila'm'feu t tender'sgthe latter lessliable to ,breakage during the ordinary and extraordinary uses. of anelectric lamp, than Where theextremlties of the filament are molded intothe glass, so that vibrations and expansion. and contraction arenecessarily required to take place within the length of the filamentitself. By making the upper collar larger than the lower. the generalcontour-of the series of filaments will be slightly conical with thesmaller truncated end of the con at the bottom. The books 27 may be.madeas long as possible within the bulb 5, and in fact, they could bequite long so that the lower collar would be larger than the upper andthereby the smaller end of the conical group of filaments would be atthe tops The use of a how 23 between the pins 22 of each hanger, looselyconnected at its end with said pins, I find to be of considerableadvantage where each filament attached to one pin leads to an adjacentpin of another hanger, because this disposition of the filaments tendsto draw the frame 20 outward and such tendency is'to an extent resistedby the how 23. The use of a curved frame 20 instead of a hanger-framewhose arms are straight, I find to be beneficial be causeit reducesvibration of the filament by ofthe lamp support, as it is obvious that astraight member cannot yield longitudinally whereas a curved member can.

I \Vhat is claimed as new is:

'1. In: an incandescent electric lamp, the

combination with a glass stem having an en larged head provided withexternal annular corrugations, the terminals leading across combinationwith a the latter, and the bulb whose neck is molded around said headfofthe tubular metallic base surrounding said neck, and the filamentscarried by said stem and connected Wltl the lnner ends of saidtermlnalsl.

2. In an incandescent electric lamp, the

lure upon it of different sizes; of hangers molded in and projectingbeyond the edge .of the upper collar, hooks moldedin and filaments.

glass stem having col-' projecting beyond the edge of the lower collar,a conical group of filaments c0nnectlng said hangers and hooks 1nseries, and the terminal wires connected with the 3. In an incandescentelectric lamp, the

combination with a bulb, and a glass stem molded in the neck of thelatter and having collars upon it; of hangers and hooks molded in andprojecting beyond the edges of the upper and lower .coll'ars, a group offilaments connecting said hangers and hooks, and the terminals moldedbetween the neck of the bulb and the upper end of the stem and connectedwith said filaments.

4. In an incandescent electric lamp, the combination with a'stem havinga pair of disks; of a crescent-shaped hanger comprising a curved wireframe having an arm projecting from its centerand molded between saiddisks and pins projecting toward each other from its extremities, and acurved wire bow standing within the frame and having eyes at itsextremities mounted on said pins, and the filaments-connect'ed'withthellatter. 1

In testimony whereofl have hereunto set my hand in presence oftwosubscribing witnesses.

EARL H. TATE.

lVitnesses:

C. W. CONWAY, M. KALTME ER.

